Analysing data from in-situ fault integrity and CO2 leakage experiments in claystone and conducting laboratory CO2 exposure experiments on intact core samples, to assess the impact of CO2 on rock hydromechanical properties. My Ph.D. is part of SMILE project (MultidiSciplinary and MultIscale approach for coupLed pro-cesses induced by geo-energies) as part of the European Doctoral Network on Geo-energy.